Aphelocheirus (Micraphelocheirus), Hoberlandt & Stys, 1979

Zettel, Herbert & Rattanachan, Kaewpawika, 2020, Aphelocheirus narumonae sp. n., second species of the subgenus Micraphelocheirus Hoberlandt & Štys, 1979 (Hemiptera: Aphelocheiridae) from Thailand, Zootaxa 4853 (1), pp. 109-116 : 115

Key to the species of the subgenus Micraphelocheirus

(adapted from Zettel & Papáček 2006, see also illustrations in that paper)

1 Rostrum at least 1.1 times longer than forefemur, surpassing anterior third of mesosternum (usually reaching or surpassing its middle)............................................................................................. 2

- Rostrum shorter than or subequal to forefemur (up to 1.05 times), not or hardly surpassing base of mesosternum.......... 5 Note: Use normal, straight specimens. In specimens that are arched ventrally post mortem, the rostrum reaches further posteriorly.

2 Abdominal sternum 3 with strongly developed posteromedian tooth............................................. 3

- Abdominal sternum 3 without posteromedian tooth, at most slightly elevated...................................... 4

3 Pronotum width 2.9 times median length. Head in front of eyes short, 0.50 times as long as eye length. Dorsal surface of head, pronotum and mesoscutellum strongly shiny, with few large punctures. Sides of sternum 7 of female posteriorly weakly converging; apex comparatively broadly rounded. ( Myanmar)........................ A. bernhardti Zettel & Papáček 2006

- Pronotum width 3.3 times median length. Head in front of eyes slightly longer, 0.58 times as long as eye length. Dorsal surface densely sculptured, pronotum and mesoscutellum rugose. Sides of sternum 7 of female posteriorly considerably converging; apex comparatively narrowly rounded. (northeastern India)............................. A. pygmaeus La Rivers ,=1971

4 Head in front of eyes 0.6 times as long as eye length. Apex of aedeagus in lateral view strongly curved. (West Malaysia)......................................................................... A. malayensis Zettel & Papáček 2006

- Head in front of eyes 0.5 times as long as eye length. Apex of aedeagus in lateral view almost straight. ( Vietnam)................................................................................ A. asiaticus =Hoberlandt & Štys ,=1979

5 Dorsum uniformly brownish yellow to reddish brown, or only abdominal tergites with indistinct pattern of darker brown marks. At least centre of head (dorsally) with shiny interspaces between large punctures................................... 6

- Dorsum with distinct yellow and dark brown pattern. Head, pronotum, and mesoscutellum densely punctured or rugose, not or hardly shiny......................................................................................... 9

6 Head elongated, in front of eyes 0.7 times as long as eye length. ( Vietnam)................ A. trani Zettel & Papáček 2006

- Head short, in front of eyes 0.45–0.55 times as long as eye length............................................... 7

7 Small species, body length 3.6–4.6 mm. Wing remnant of brachypterous morph relatively slender, its maximum width less than or subequal to half of length (0.45–0.52). Distal part of sternum 7 comparatively narrow (as in Fig. 8 ).................. 8

- Larger species, body length of female 5.0 mm. Wing remnant of brachypterous morph stouter, its maximum width more than half of length (0.56). Distal part of sternum 7 broad. ( China: Yunnan)................... A. jaechi Zettel & Papáček 2006

8 Body length 4.1–4.6 mm. Disc of pronotum, mesoscutellum, and metanotum with large shiny areas. Parameres of male as in Figures 13 and 14 . (northern Thailand)................................. A. brevirostris =Polhemus & Polhemus ,=1989

- Body length 3.5–3.8 mm. Disc of pronotum, mesoscutellum, and metanotum chiefly matte. Parameres of male as in Figures 10 and 11 . (northeastern Thailand).......................................................... A. narumonae sp.n.

9 Abdominal sternum 3 with posteromedian tooth. Head, pronotum, and mesoscutellum shiny, areas between large punctures with smaller, only partly confluent punctures. (northeastern India)............................. A. signatus Zettel ,=1998

- Abdominal sternum 3 without posteromedian tooth. Head, pronotum, and mesoscutellum matte, areas between large punctures rugose. ( Sri Lanka)............................................................ A. clivicolus Polhemus ,=1979

Figures

FIGURES 3–8. (3–5) Dorsolateral view of head, pronotum and mesoscutellum: (3) male holotype and (4) female paratype of Aphelocheirus (Micraphelocheirus) narumonae sp.n., (5) non-type specimen of A. (M.) brevirostris. (6) Ventral view of anterior body portion of holotype of A. (M.) narumonae sp.n. (7) Forewing remnant of holotype of A. (M.) narumonae sp.n. (8) Sternum 7 and laterosternites 7 of female paratype of A. (M.) narumonae sp.n.

FIGURES 9–14. Male genitalia. (9–12) Aphelocheirus (Micraphelocheirus) narumonae sp.n., (13, 14) A. (M.) brevirostris. (9) Genital capsule after dissection of aedeagus and parameres, showing parandria. (10, 13) Left paramere. (11, 14) Right paramere. (12) Aedeagus, lateral aspect.